Removing And Replacing The A42-A45 Bias Tees - Keysight N5224A Service Manual

Repair and Replacement Procedures
Removing and Replacing the A42–A45 Bias Tees
Removing and Replacing the A42–A45 Bias Tees
Tools Required
• T-10 TORX driver (torque to 9 in-lb or 1.02 N.m)
• T-20 TORX driver (torque to 21 in-lb or 2.38 N.m)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-21 for this procedure.
CAUTION Be careful not to damage the center pins of the semirigid cables. Some flexing of the cables
is necessary to remove assemblies but do not over-bend them.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to
3. Position the analyzer bottom side up.
4. Disconnect two semirigid cables (item
5. Remove two screws (item
harness cable ground wire for reinstallation later.
6. Disconnect the wire harness cable (item
7. Move the disconnected semirigid cables out of the way and remove the bias tee from the analyzer. It may
be necessary to loosen the other end of the cables to allow them to be moved. Do not overbend them.
Replacement Procedure
1. Reverse the order of the removal procedure.
Torque all cable connections to 10 in-lbs.
Remember to place the wire harness cable ground lug on the proper mounting screw.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page
7-44
"Removing the Covers" on page
①
) from the bias tee to be removed.
➁
) from the bias tee to be removed. Make note of the location of the wire
③
) from the A23 test set motherboard.
7-56.
PNA Series Microwave Network Analyzers
N5224A and N5225A
7-6.
Service Guide N5225-90001